System design interviews can be daunting. It's not just about coding; it requires a deep understanding of architecture, scalability, and trade-offs. Knowing patterns like microservices, CAP theorem, and load balancing can make a significant difference. A solid knowledge of tools like Kubernetes for orchestration or Redis for caching can help you throw in relevant technical details.

When preparing, focus on designing real-world systems. Start by sketching out architectures on paper. Think through different scenarios, like handling sudden traffic spikes or ensuring data consistency. Reference systems like how Twitter manages tweets or how Uber handles ride notifications. Practical knowledge can really set you apart in discussions.